Safety device for elevators.



J. GEHMAN.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED 11011.7, 1912.

1,109,412, 1 Patented Sept. 1,1914.

2 SHEETSSHEBT 1.

amoemo z w attozmu THE NORRIS PETERS CO.. PHOTD-LITHO.. WASHINGTON. u C

J. GEHMAN.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED NOV. '1, 1912.

Patented Sept. 1, 191 1 2 snnmrssimm 2.

MnAM

To all whom may concern ,Beit mownth t I, JOHN ahitizen of the United I States, residing at Brutus,

in the county of lilmmet and StateQofMiehigain; h ve, in n d ne an use l l mpre ments in Safety Devices 'for Elevators of which the following is-a specification;

My present lnvention relates to 'safety de vioes for elevators including governor ineeh anism operatively connected with braking means, to set the latter when the elevator caneXceeds a predetermined;speed injits K I J Figure 1 is a front elevation oiithe mechanism showing its application toa ear. F g, l

nectio 1 t. a y refer to similar parts, 'designates carjunta,

' shaft,1 fend also an upright rack 6., w 1th ts tread at; alright angle to, the treads; 9f

descent..,

The principal object of my inventioniisto o provide means operable-automatically, re-

gardless of any" other controllingmeoha nismod? the elevator, and withoiitattention by the car operator or passengers ito effect a stoppage of the earshonld 1t ;drop,or start to descend atan unsaf'espeed a Other h'ects 01E my'invention the following detailed" descriptlom taken I in connection with the accompanyingdrawmwhi h a in 2*is a eross sectional view- ,onthe,. line offFig, 1Q 3 is an lenlargeddeta led View, partly in v, section, showing governor mechanism. Figi' & is, -an enlarged fraga Inentary sectional view lllustrating the 0011- n hetween the spindle andfangle arm of the device,

In the drawlngs, where Similar of the type ,movable verticallyi'na 51 a] .f Laterally of the car b dy, PFWl ght parallel "tracks; .5 spaced apart. from eaqh Q her at Opposite sidesofthe elevator L'Ihe car fl. earries a frame? ,1, for

to be.subsequentlyudeserilbed, and p oseillatable depending g itesis, d sposed ",1 atera yoHmks "Morabl {towed 1d or shoesare preferably carried by guides. 1S,'so

that. they reciprocate transversely thereof,

but are not rotatable. Each'slioe-is provided Specification rimers Patent migs forming a part of this speei fieationgand fir mletek'sfa ad; carriedb'y guide 8H, are br'ak'e shoes 9i These taneously in counter directions, I have. desig-- JGI-IH, or m ms; MICHIGAN,

v I Patented. sept'yi, 1914. Li A plicat on fi1a nb 1ember7, a12.I ser a nanoms I nated generally by 11. This mechanism may comprise agshatt 12, having ends screw threaded n opposite directions and ,complementary" to the threaded reoesses-"lo ofshoes as indieatedby larrows, separating shoes 9.-

,, The frame 7 carries governor mechanism,

2 9; into they extend, to move the shoes 1 simultaneouslyin, counter; directions; arms -13 revoluhly supporting shaft 12'and pendentlyf supported fromframe ;7,Ithe" arms 13 i and guidesS being mounted for oscillatory "movement; and, a gear l4, rig-idwith shaft 1 12, tobe swung into, mesh with rack 6, so

that upon descentof the car; if gear 14 does lneshwith said rack, shaft 12 will be rotated designed generally by 15. @[lhis mechanism is preferably of that type having Weights l6 snspendedby'linksl'i -yfrom a collar 18 rigidjwith a sp1ndlel9,ithis ,SPindle being revolnbly carried by frameff.- LinksQO connect loalls 16 and a member 21revoluble with spindle 12 and axially movable, onreeiprogable thereon. a

In order to operate goye-rnor mechanism '1 5.- fromrack 6,1, providegearing,gdesig nated' generally 22. This gearing may comprise a'bevel gear23earriedby frame7, v

rigidwith spindle 519; a meshing bevel gear 24; a pinion 25 to rotate gear24 and a gear 26 meshing Withpinie'n 25 and with ra'ck 6.

Thus, movement of the "descending car rotates gear 26, which inturn successively ro- \tates-ipinion 25, gear 24: and gear 23, which latterrotatesfspindle 19, the eentriiugal action upon Weights 16 causingthem to sepa- 35 rate, raising member 21. a

"Operatively connected Wllih' governor mechanism 15,: I, provide means for imparting movement of reeip-rocabl-e. memberQltto the: mechanism 11, torender thesame 'active. This means, designated generally by; 27,

preferably includes a lever 28 pivoted to frame 7,, a. link 29 operatively eonnecting a reeiproeable spindle, 30,,rexiolu'bly carried by frame 7, accommodated its uppere end a. recess, 31 in spindle 19 and operatively connected; with member Z'l-asibyglngs; 32, so.

eel. t -Q n .e Q'n ell 1 1th? 100 one arm of lever 28 with: one of the arms I3 throughlink 29 and one of the arms 13'.

determined rate, the balls 16, raiseine mber 21 sufliciently tobringsaid gearsl l into meshing relation with racks 6. The shaft 12 is then rotated as previouslydescribed moving shoes 9 into contactwithtracks 5.

' Suitable-locking mechanisni' is provided to retain gear 14' in meshing relation with track 6, when governor mechanism lonioves locking-mechanism may comprise a pawl 35, pivoted to c'ne' arml3, as*at,36,.and adapted to engage inn'otch" 37', provided in frame 7,

when said arm has been'moved sufliciently r to bring the gear 14 into meshing relation with rack 6.

From the foregoing, it is made manifest that I providea safety device forelevators, including brake shoes adapted to friction 'ally engage suitable tracks, when the car, in descent, exceeds a predetermined speed;

It is of course obvious, that thisg inechanism is applicable to elevators of thetype having an'inclined'path ofmovement, as well as those movable vertically. v

Changes in details may be vmade without departing from the spirit 'orjscope of in-- vention; but, I'cla1m: A

1. In a safety attachment forelevator cars, the combination witha vertical rack,

of non-rotata-blebrake shoes supported by said carthe'said shoes being provided with complementary recesses, afshaft connectlng I J said shoes, said'shaft being threaded oppo sitely at its respective extremities to engage the complementary recesses "of said shoes, and means operable at a predetermined speed of descent of said car and engageable with said rack for rotating said'shaft to actuate said shoes, as and for the purpose set forth. l I I i 2. The combination with an elevator car, and an upright track and upright rack .dis-

" posed laterally thereof, or a brake shoe'carried by said car movable from or to contact with said, track, means including a gear adapted to'mesh with said rackto move said shoe into contact with said tracks duringdescent of the car, and second means including a gear 'meshing with rack to move the said gear of said first-mentioned means into mesh with said rack when the car descends at a] predetermined speed, substantially as and for the purpose set forth.

The combination with an elevator car, and upright' tracks, disposed in parallelism, andjan upright rackdisposed"laterally of 7 the car, of brake shoes, carried byrsaid .car,

oneforeach track-movable from or to contact .ftherewith, @means including a gear adapted to mesh with said rack, to move said .scendsfat a predetermined speed, substanried by said car movable. from orto contact v v I Wltll said track, means ncluding a gear said gear] tosuch relative position. This I ing descent of the car, secondmeanspincludshoes sif'mi'iltaneously in counter directions to contact with, their respective tracks, and second means including a gear meshing with said rack, to move said first-mentioned gear into mesh with said rack when the car detially' as and for the purpose set forth.

' 4;." The combination with an elevator car, and an'upright track and upright rack disposed laterally thereoffof a brake shoe car-' adapted'ito mesh with said rack to move saidshoe' intocontact "withsa-id track dur- 3O ing agear meshing with said rack to move the said gear ofsaidfirst-mentioned means intomeshwith, said rack when the car descends at a predeterminedspeed, and looking mechanism for retaining said first-mentioned gear in mesh with said rack, when actuated by said second means, substantially as and for the purpose set'forth. p

5. The combination with an elevator car, and two upright tracks disposed in parallelism, and an upri ht rack disposed laterally of the, car,;of brake shoes, carried by said car,onefor each track, movable from or p to contact therewith, and each having a screw-threaded recess, said recesses facing each other with a common axis, a .shafthav ing ends screw threaded in opposite direcf tions, tofit'into the saidrecesses ofsaid shoes, a gear for rotating said shaft during descent of the car, adapted to mesh with said rack, and second means including a gear meshing with saidrack to move. thesaid first-mentioned gear into mesh with said rack, when the car descends at a predetermined speed, substantially as. and for the purpose set forth. g

6. The combination with an elevatorcar, and two upright tracks disposedin p 'arallelism, and an upright rack disposed laterally of the car,'of brake shoes, carried by said car, one for eachtrack, movable from or to contact therewith,'and each having a screw threaded recess, said recesses facing each A, other with a common axis, ashaft'having ends screw threaded in opposite directions, to fit into the said recesses of said shoes', a gear forrotating said shaft during descent ofthecar, adapted to mesh with "saidjrack, secondmeans including a gearvmeshing with said rack to mov'e the said first-mentioned I actuatedby said second means, substantially posed laterallythereof, of a brakeshoe' carried'by saidcar movable from or to contact with said track, means including a gear adapted to mesh with said rack to move said shoe into contact with said track during o ,ing a reciprocable member connected With said second means to operatively actuate the same when the car descends at a predetermined speed, substantially as and for the purpose set forth.

8. The combination with an elevator car, and an upright track and upright rack disposed laterally thereof, of a brake shoe carried by said car movable from or to contact with said track, means including a gear adapted to mesh with said rack to move said shoe into contact with said track during descent of the car, second means for moving the gear of said first-mentioned means into mesh with said rack, governor mechanism operable from said rack, including a reciprocable member connected with said second means to operatively actuate the same when the car descends at a predetermined speed,'

and locking mechanism for retaining said gear in mesh with said rack when actuated by said second means, substantially as and for the purpose set forth.

9. In a safety attachment for elevator cars, the combination with a vertical rack bar, governor mechanism operable beneath said car, means engageable withfsaid rack bar and having connection with said governor mechanism for actuating the latter aci cording to thespeed of movement of said car mechanism normally disposed out of engagement with, said rack, means actuatable at a predetermined speed of rotation of said governor mechanism for bodily moving said last mentioned mechanism into engagement with said rack, and means operablevby said last mentioned mechanism when inengagement with saidrack to check movement of said car, as and for the purpose set forth.=

" JOHN GEHMAN.

Witnesses: e

WILLIAMS. Dnrrwnrmin,

JOHN WURST.

aof

Copies of this patent may be obtained for five cents each, by addressing the, Commissioner of Patents,

Washington, D. C. 

